Mitogen-activated protein kinase kinase kinase 20 (MAP3K20)

Mitogen-activated protein kinase kinase kinase 20 (MAP3K20) is a cytoplasmic, magnesium-binding serine/threonine kinase that functions as a signal transduction enzyme in the MAP kinase signaling cascade[1][2][3][6]. MAP3K20 mediates responses to diverse cellular stresses—such as gamma radiation, ribotoxic stress, osmotic shock, and UV irradiation—by phosphorylating downstream kinases, leading to the activation of JNK and p38 MAPK pathways. It plays key roles in cell cycle checkpoint control, programmed cell death (apoptosis), and has both pro-apoptotic and cell survival functions depending on stress context[1][3]. The protein exists as multiple isoforms (including ZAKalpha and ZAKbeta) and is also implicated in the regulation of cardiac stress, inflammation via the NLRP1 inflammasome, and certain developmental and neuromuscular disorders[1][6]. It is considered a potential cancer suppressor in cervical cancer and other malignancies, as well as a candidate for therapeutic targeting in stress and apoptotic pathways[1][6].

Other names

MLTKMLK7ZAKMRKMixed lineage kinase 7MLTKalphaMLTKbetaHuman cervical cancer suppressor gene 4 proteinHCCS-4MLK-like mitogen-activated protein triple kinaseZAK1 homologMLK-related kinaseCNM6SFMMPAZKMLTSterile alpha motif- and leucine zipper-containing kinase AZKMixed lineage kinase-related kinase MRK-betaPkEC 2.7.11.25EC 2.7.11

Inhibition of MAP3K20 kinase activity decreases downstream phosphorylation of MAP kinase kinases, suppressing activation of JNK and p38 pathways, thereby reducing stress-induced apoptosis and inflammatory responses